Crank-shaft.



A. DE CONINGK.

CRANK SHAFT.

APPLICATION FILED JUNE 11, 1912.

Patented Nov. 4, 1913.

ARTHUR DE CONINCK, OF WOLUiE-SUwLAT-IIBERT, NEAR BRUSSELS, BELGIUM.

CRANE-SHAFT.

Application filed une l1, i9l2- To ZZ whom t may concern Be it knownthat I, ARTHUR Dn Coninck,

a subject of the King of Belgium, residing at ,Voluwe-St.-Lambert, nearBrussels, in the Kingdom of Belgium, have invented certain new anduseful improvements in Crank- Shafts.

ln engines with four cylinders without a central bearing, hitherto ithas been particu larly difficult, if not impossible, to lubricate thetwo central crank pins by -oil circulation. The action of centrifugalforce prevented the oil from reaching these crank pins through theconduit of the crank shaft.

rihis invention relates to a conduitI rangementwhich obviates thedrawback in question and enables the centrifu. l force to be utilizedfor facilitating and even bringing about the circulation toward thecentral crank pins.

The accompanying drawing shows, by way v of example, a construction ofthe arrangement in question.

tion of a crank shaft with four crank pins, but two of the pins beingshown and the shaft being without a central bearing. Fig. 2 is an endview thereof partly in section. Fig. 3 is a section on the line 3-3 ofFig. l.

In the drawing, a is one of the ends of the shaft, Z) one of the endjournals, c one of the end cranks, (Z one of the end crank pins, o oneof the double central cranks and .f one of the central crank pins.

lThe oii supplied under pressure to the end bearing, passes through theopening g of the bearing .7) into the main conduit ZL and follows thepath indicated by the full arrow up to '5, that. is to say, up to thecenter of the crank e, where the. main conduit ZL branches oii' into twoconduits y' Zu arranged in line with each other each going toward oneend of the cra-nk c in order to supply ,respectively the end crank pinCZ 'through an opening Z, and the central adjoining crank pin f througha similar orifice (not shown).

It will be understood that the oil s pplied to the point t', in thecenter of the double crank, is forced, in two opposite currents of equalsize, by the act-ion of centrifugal force, toward the two opposite crankpins Z and which are then lubricated identically to the same extent.

The same arrangement of conduits is provided at the other end of thecrank shaft Speccaton of Letters Patent.

resented nave, i913.

Serial No. 763,068.

for lubricating the corresponding end crank pin and central crank pin.

It wiil be seen at once that with a single continuous conduit forsupplying the two crank pins Z j', there would be an excessivelubrication at the orifice Z for the crank pin rZ, but that in order topass from the crank pin (Z to the point i and thence to the crank pinji, the oii would have to overcome the action of centrifugal force whichis the greater, the longer the arm of the crank and the greater thespeed of rotation. in these conditions, the lubrication of the centralcrank pins is possible (and then only with very bad distribution of oil)only by using excessive pressure of oil at the end bearings,

so as to overcome the resistance of centrifugal force.

Perfectly tight closing of the end bearings which moreover cannot beobtained in practice, becomes an important condition and makes itimpossible to obtain sufficient lubrication for the central crank pins.Figure i is a partial longitudinal eleva" i.

Having now particularly described and ascertained the nature of my saidinvention, and in what manner the saine is to be performed, i declarethat what I claim is:

1. in a crank shaft provided with a plurality of pins, said shaft beingprovided with conduits for equally lubricating adjacent pins comprisino'a conduit leading through said shaft from one end to a pointintermediatc a pair of adjacent pins, and branch conduits leading fromthel iirst conduit at said intermediate point and opening outwardthrough respective pins.

2. ln a crank shaft provided with a pair of pins connected by a doublearmed crank, said shaft being provided with conduits for equaliylubricating said pins comprising a conduit leading through said shaftfrom one end thereof to a point in said double armed crank in the axisof said shaft, and branch conduits leading through said crank shaftfromsaid rst. mentioned conduit and opening outward through said pins, saidbranch conduits communicating with the first conduit at said axialpoint.

in testimonv whereof i ai'iii; mv sienature Witnesses:

L. Pnan'r'rn, (l1-ias. ROY NASMITH.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington. D. C.

